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4iiii Precision GRX RX-810 left powermeter

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4iiii Precision GRX RX-810 left powermeter

RRP: £349.00

Our Price: £314.10

Availability: ships in 60 days


The replaces your current crankarm.

Please cheack your frame has clearance for the sensor before installing.


  • 3D power meter technology (patent pending) measures tri-axial strain on your crank

  • Accurate, consistent data

  • Lightweight, compact design

  • Battery status indicator via 4iiii app

  • Compatible with ANT+, Bluetooth Smart head units, smartphones, and other 4iiii products

  • User-friendly app and configurable rider compensation scale factor

  • Easy setup and maintenance

  • Over-the-air upgrade capability for adding new features and updates


  • Weight: 25 grams (power meter only)

  • Data accuracy: +/- 1% error margin

  • Battery life: 100+ hours on 2032 coin cell battery

  • Battery status indicator: Alert at 15% battery power


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RRP: £349.00

Our Price: £314.10



Designed to match your Shimano GRX crankset

Used to pace attacks up the Alpe D’Huez in the Tour de France and to hammer on the Queen K during the Ironman World Championships, the PRECISION Powermeter delivers industry leading accuracy and reliability when you need it most. Through our patented 3D Strain Gauge technology, you can be assured that the data you depend on will help lead you to your own Yellow Jersey.

Packaged into a durable lightweight design and compatible with ANT+ and Bluetooth Smart headunits, PRECISION will help you train harder and smarter.

A Ride Ready PRECISION includes and comes preinstalled on a brand-new Shimano crank arm of your choice. These crank arms will fit bottom brackets using the Hollowtech II interface.

How Does It Work?
A ride ready PRECISION pod is already preinstalled on a brand-new Shimano crank arm at our factory. The moment you order, our fulfillment team will get it on its way to you, and you should be able to ride with power as soon as it arrives.
Important: You need to use the frame clearance pages below to ensure there is space between your crank and frame for the PRECISION pods.
In The Box
Once your ride-ready PRECISION powermeter arrives, it just needs to be installed on your bike using the standard Shimano crank installation process. Connect a headunit or computer, and you can start riding with power!
Tip: If you're unsure, a bike shop would be happy to aid you in the installation process.
Warranty & Durability
Ridden through rain storms at Strade Bianche, mud filled cross country mountain bike races, and even tested amidst the salt spray of the ocean on Oracle Team USA's America's Cup competitors, you can be assured that your 4iiii Powermeter will be as tough as you are and is backed with an industry leading 3-year warranty. All 4iiii Powermeters are IPX7-rated for water immersion up to one meter and backed with an industry-leading 3-year warranty.
Indoor Training
If the weather or climate make riding outdoors tough, your 4iiii PRECISION powermeter can be used with all popular indoor-training apps, such as Zwift, TrainerRoad, TheSufferFest, Rouvy, and more. Simply use your favourite app's connection procedure over ANT+ or Bluetooth Smart, put your bike on a trainer, and get riding!
Module Weight
9g (0.3oz)
Power Range
Cadence Range
Communication Protocols
ANT+, Bluetooth
Operating Temperature
0 to 50°C (32-122°F)
Storage Temperature
-20 to 50°C (4-122°F)
Battery Type
CR2032 lithium ion coin cell
Battery Life
100+ hours
Waterproof Rating
37.7mm (1.5in)
27.6mm (1.1in)
7.5mm (0.3in)
Additional Information

Additional Information

Brand 4iiii